Psoraisis of the scalp and body

I have been suffering from Psoraisis of the scalp from the age of 12yrs (I am 32 now!)It spread over to my body gradually and keeps coming on and off. The Psoraisis had disappeared when I was pregnant but came back within a year of child-birth. My child is 7yrs now.I have been on several medications(allopaethic, homoeopathic, Tibettan, ayurvedic ) which do provide relief for sometime but as soon as the medicine is stopped, it comes back with double the force. I believe sea-water/salts help in curing Psoraisis.

Can somebody help with better and long term solutions as this is making my spirits lower and turning me into a less confident person.....I can't wear short-sleeves, I can't swim, I can't act normally.....